It is hard to say what caused your tax to go up more than the 15% capital gain tax with such limited information. It could be that the capital gain put you in a higher tax bracket. You should review your entry for the sale of Bitcoin to make sure it was entered correctly, both the amounts and the holding period.
You can review your tax return and the applicable tax worksheet used to calculate your tax. To do so, you will have to pay for your return before filing. For instructions, see this TurboTax Help Article: Can I print a copy of my return in TurboTax Online before I file it?
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